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[mininet-discuss] Does OVS in Mininet 2.2.1 support modify the packet's IP address and the output this packet?

Bob Lantz rlantz at cs.stanford.edu
Mon Jul 11 14:36:18 PDT 2016


Please don't post to multiple lists. ;-(

> On Jul 11, 2016, at 6:52 AM, Shawn Lin <x.shawn.lin at gmail.com> wrote:
> 
> Hi all,
> 
> I am trying to use OpenvSwitch to exchange the source IP address and the destination IP address of a packet, and then forward this packet out to a host in Mininet. 
> 
> I do this test in Mininet(2.2.1) and OpenvSwitch(2.0.2), And below is the command:
> 
> Topology in Mininet is quite simple,
> h1-s1-h2
> 
> I use this command to add the flow.
> mininet> sh ovs-ofctl add-flow s1 dl_type=0x0800,dl_type=0x0800,nw_dst=10.0.0.2,actions=mod_dl_src:00:00:00:00:00:02,mod_dl_dst:00:00:00:00:00:01,mod_nw_src:10.0.0.2,mod_nw_dst=10.0.0.1,output:1 -O OpenFlow13
> 
> And then I could see the result when I show flows in the switch s1,
> 
> mininet> sh ovs-ofctl dump-flows s1 -O OpenFlow13
> OFPST_FLOW reply (OF1.3) (xid=0x2):                                                                                                                                                                                                                                             
>  cookie=0x0, duration=418.133s, table=0, n_packets=1813, n_bytes=2731190, ip,nw_dst=10.0.0.2 actions=mod_dl_src:00:00:00:00:00:02,mod_dl_dst:00:00:00:00:00:01,mod_nw_src:10.0.0.2,mod_nw_dst:10.0.0.1,output:1                                                      
>  In my understanding, this flow would change the packets' src IP, dst IP, src Mac, dst Mac, and then forward it out port 1 which is s1-eth1.  
> 
>  cookie=0x2b0000000000000f, duration=2982.739s, table=0, n_packets=1, n_bytes=42, priority=2,in_port=1 actions=output:2,CONTROLLER:65535                                                                                                                                       
>  cookie=0x2b0000000000000e, duration=2982.739s, table=0, n_packets=1, n_bytes=42, priority=2,in_port=2 actions=output:1,CONTROLLER:65535                                                                                                                                       
>  cookie=0x2b0000000000000f, duration=2986.774s, table=0, n_packets=0, n_bytes=0, priority=100,dl_type=0x88cc actions=CONTROLLER:65535                                                                                                                                   
>  cookie=0x2b0000000000000f, duration=2986.774s, table=0, n_packets=0, n_bytes=0, priority=0 actions=drop   
> 
> And then in terminal, I use tcpdump to catch the packets through s1-eth1,
> tcpdump -i s1-eth1 -w result.pcap
> 
> I scan all packets and find that these packets are all with src IP 10.0.0.1, and dst IP 10.0.0.2.
> At the same time, the n_bytes in flow shows that this flow has been hit. 
> 
> So Am I doing some wrong configuration? Or which version of OVS support this feature? Any suggestions or comments are welcomed!
> 
> I am looking forward to hearing from you!
> 
> Bests,
> Shawn Lin 
> _______________________________________________
> mininet-discuss mailing list
> mininet-discuss at lists.stanford.edu
> https://mailman.stanford.edu/mailman/listinfo/mininet-discuss

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